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20x+40=15x+15
We move all terms to the left:
20x+40-(15x+15)=0
We get rid of parentheses
20x-15x-15+40=0
We add all the numbers together, and all the variables
5x+25=0
We move all terms containing x to the left, all other terms to the right
5x=-25
x=-25/5
x=-5
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